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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Statements of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   2,400,000 2,750,000 2,750,000
Creations (in Shares)   250,000   450,000
Redemptions (in Shares)   (1,050,000)   (800,000)
Closing balance (in Shares) 1,600,000 1,600,000   2,400,000
Opening balance   $ 241,555 $ 178,252 $ 178,252
Net investment loss $ (275) (632) (593) (1,278)
Realized gain on investment in palladium   26,453   14,603
Change in unrealized gain/(loss) on investment in palladium (27,540) (49,731) $ 34,658 77,205
Creations   24,277   37,402
Redemptions   (97,026)   (64,629)
Closing balance $ 144,896 $ 144,896   $ 241,555